阅读说明：本技术 复合型热回收燃烧系统 (Composite heat recovery combustion system ) 是由 任峻岭 龚亦辉 于 2019-12-04 设计创作，主要内容包括：本发明公开了一种复合型热回收燃烧系统,包括：第一蓄热箱,第二蓄热箱,鼓风机,四通换向阀,引风机,换热器和燃烧器；所述第一蓄热箱通过第一换向管连接四通换向阀；所述第二蓄热箱通过第二换向管连接四通换向阀；所述鼓风机通过连接二次风管连接四通换向阀；所述引风机通过烟气管路连接四通换向阀、所述烟气管路穿过换热器；所述燃烧器,第一蓄热箱和第二蓄热箱连接燃烧空间；所述燃烧器通过燃气管路连接外设燃气气源,所述燃气管路穿过换热器。本发明能够克服现有设备在适宜温度区间外工作时已损坏的问题、对处于不同温度区间的燃烧室进行有效热回收、提升热回收率。(The invention discloses a composite heat recovery combustion system, which comprises: the heat recovery system comprises a first heat storage box, a second heat storage box, a blower, a four-way reversing valve, an induced draft fan, a heat exchanger and a combustor; the first heat storage tank is connected with the four-way reversing valve through a first reversing pipe; the second heat storage tank is connected with the four-way reversing valve through a second reversing pipe; the blower is connected with the four-way reversing valve through a secondary air pipe; the induced draft fan is connected with the four-way reversing valve through a flue gas pipeline, and the flue gas pipeline penetrates through the heat exchanger; the first heat storage box and the second heat storage box of the burner are connected with the combustion space; the combustor is connected with an external gas source through a gas pipeline, and the gas pipeline penetrates through the heat exchanger. The invention can overcome the problem that the existing equipment is damaged when working outside the proper temperature range, and can effectively recover heat of the combustion chambers in different temperature ranges and improve the heat recovery rate.)

1. A hybrid heat recovery combustion system comprising: the heat-accumulating type heat-collecting device comprises a first heat-accumulating box (11), a second heat-accumulating box (12), an air blower (2), a four-way reversing valve (3) and an induced draft fan (4);

it is characterized by also comprising: a heat exchanger (5), a burner (61);

the first heat storage tank (11) is connected with the four-way reversing valve (3) through a first reversing pipe (121);

the second heat storage tank (12) is connected with the four-way reversing valve (3) through a second reversing pipe (122);

the blower (2) is connected with the four-way reversing valve (3) through a secondary air pipe (7);

the induced draft fan (4) is connected with the four-way reversing valve (3) through a flue gas pipeline (8), and the flue gas pipeline (8) penetrates through the heat exchanger (5);

the combustor (61), the first heat storage tank (11) and the second heat storage tank (12) are connected with a combustion space; the combustor (61) is connected with an external gas source through a gas pipeline (9), and the gas pipeline (9) penetrates through the heat exchanger (5).

2. A hybrid heat recovery combustion system according to claim 1, further comprising: a small fan (62) and a primary air pipe (63); the small fan (62) is connected with the burner (61) through a primary air pipe (63).

3. A hybrid heat recovery combustion system according to claim 2, wherein: the primary air pipe (73) penetrates through the heat exchanger (5).

4. A hybrid heat recovery combustion system according to claim 2, wherein: the heat exchanger (5) adopts a condensing heat exchanger.

5. A hybrid heat recovery combustion system according to claim 2, wherein: the heat exchanger (5) adopts a dividing wall type heat exchanger.

Technical Field

The invention relates to the technical field of heat energy recovery and utilization, in particular to a composite heat recovery combustion system.

Background

In the prior art, combustion systems with preheating recovery mainly comprise simple regenerative combustion devices or simple heat exchanger devices. The simple heat storage combustion equipment is respectively connected with the two heat storage boxes, the air blower and the induced draft fan through the four-way valve. The working process is as follows: high-temperature flue gas in the combustion chamber enters a heat storage box through the work of the four-way valve, exchanges heat with a heat accumulator in the heat storage box, is cooled and then is discharged out of the combustion chamber through the induced draft fan. Meanwhile, the air blower introduces external air into another heat storage box, and the external air enters the combustion chamber to participate in combustion reaction after being heated by the heat accumulator in the heat storage box. After working for a period, the four-way valve switches the gas flow direction, so that the two heat storage tanks alternate with each other to perform the next heat storage. The working process of the simple heat exchanger device is to transfer the heat of the flue gas to the air and then put the high-temperature air into the combustion area to participate in the combustion reaction. The two schemes have an optimal working temperature range respectively. The heat storage device is suitable for working at a high-temperature section above 800K. The reason for this is that: in the temperature range with lower temperature of the combustion chamber, the viscosity and the humidity of the smoke generated by combustion are higher. After the flue gas enters the heat storage box, dust is easily attached to the heat storage body, and the heat transfer efficiency is reduced gradually. At the same time, the dust is also difficult to clean. And the heat exchanger is suitable for heat recovery in a temperature interval of less than 700K. The reason for this is that: the higher the temperature is, the higher the requirements on the heat conductivity, the temperature resistance and the strength of the material of the heat exchange device are, and at present, the partition wall type heat exchange material which simultaneously meets the requirements on the heat conductivity, the temperature resistance and the strength in a high-temperature interval is difficult to find. Therefore, at present, there is no heat recovery combustion system, which can perform thorough heat recovery on the kilns with the working temperatures in the high-temperature interval and the low-temperature interval respectively. Therefore, it is an objective of the present invention to develop a new heat recovery combustion system to overcome the above problems.

Disclosure of Invention

The invention aims to provide a composite heat recovery combustion system which can overcome the problem that the existing equipment is damaged when working outside a proper temperature range, effectively recover heat of combustion chambers in different temperature ranges and improve the heat recovery rate.

The technical scheme adopted is as follows:

a hybrid heat recovery combustion system comprising: the heat recovery system comprises a first heat storage box, a second heat storage box, a blower, a four-way reversing valve, an induced draft fan, a heat exchanger and a combustor; the first heat storage tank is connected with the four-way reversing valve through a first reversing pipe; the second heat storage tank is connected with the four-way reversing valve through a second reversing pipe; the blower is connected with a four-way reversing valve through a secondary air pipe; the induced draft fan is connected with the four-way reversing valve through a flue gas pipeline, and the flue gas pipeline penetrates through the heat exchanger; the combustor, the first heat storage box and the second heat storage box are connected with a combustion space; the combustor is connected with an external gas source through a gas pipeline, and the gas pipeline penetrates through the heat exchanger.

By adopting the technical scheme: the external gas source outputs gas to the combustor through a gas pipeline, and meanwhile, the air blower guides external air into the first heat storage box, heats the external air through the heat storage body in the first heat storage box and then enters the combustion chamber to enable the combustor to keep continuous work in the combustion chamber. High-temperature flue gas generated in the combustion chamber firstly enters the second heat storage box under the action of the draught fan, and carries out preliminary heat exchange and cooling with a heat accumulator in the heat storage box, and then enters the heat exchanger. At the moment, the high-temperature flue gas after primary cooling is further subjected to heat exchange with the fuel gas in the fuel gas pipeline in the heat exchanger, and is finally discharged out of the combustion chamber through the induced draft fan after secondary cooling for subsequent treatment. Meanwhile, the energy consumption of the combustion chamber in the combustion process is reduced by the temperature of the fuel gas output to the combustor through the fuel gas pipeline. From this, realized through the heat exchanger to the secondary heat transfer of the high temperature flue gas of combustion chamber exhaust, showing and promoting the heat recovery rate.

Preferably, the hybrid heat recovery combustion system further includes: a small fan and a primary air pipe; the small fan is connected with the burner through a primary air pipe.

By adopting the technical scheme: and a small fan is used for injecting external air into the combustor in a supplementing way through the primary air pipe. The air pressure value of the combustor in the combustion chamber is improved, so that the combustion efficiency of the combustor in working is improved, and the problem of insufficient combustion caused by insufficient air reaching the combustor is solved.

More preferably, in the hybrid heat recovery combustion system: the gas pipeline passes through the heat exchanger. The primary air pipe penetrates through the heat exchanger.

By adopting the technical scheme: the air blown into the primary air pipe by the small fan exchanges heat with the high-temperature flue gas in the heat exchanger, so that the temperature of the air reaching the combustion chamber is increased, and the cooling effect of the high-temperature flue gas in the heat exchanger is further optimized.

More preferably, in the hybrid heat recovery combustion system: the heat exchanger adopts a condensing heat exchanger.

By adopting the technical scheme: the condensation type heat exchanger is used for recovering the latent heat of vaporization of the water vapor component in the flue gas output by the combustion chamber, so that the utilization rate of energy is further improved.

Another preferable aspect is that, in the hybrid heat recovery combustion system: the heat exchanger adopts a dividing wall type heat exchanger.

Compared with the prior art, the invention has simple structure and easy realization, can overcome the problem that the prior equipment is damaged when working outside the proper temperature range, effectively recovers heat of the combustion chambers in different temperature ranges, and improves the heat recovery rate.

Drawings

The invention is described in further detail in the following description of embodiments with reference to the accompanying drawings:

FIG. 1 is a schematic diagram of a prior art structure;

fig. 2 is a schematic structural diagram of embodiment 1 of the present invention.

The corresponding relation between each reference mark and the part name is as follows:

11. a first heat storage tank; 12. a second heat storage tank; 2. a blower; 3. a four-way reversing valve; 4. an induced draft fan; 5. a heat exchanger; 61. a burner; 62. a small fan; 63. a primary air duct; 7. a secondary air duct; 8. a flue gas pipeline; 9. a gas pipeline; 121. a first reversing tube; 122. and a second reversing tube.

Detailed Description

In order to more clearly illustrate the technical solution of the present invention, the above description will be further described with reference to various embodiments.

As shown in FIGS. 1-2, example 1 of the present invention:

a hybrid heat recovery combustion system comprising: the heat-accumulating type heat-accumulating box comprises a first heat-accumulating box 11, a second heat-accumulating box 12, an air blower 2, a four-way reversing valve 3, an induced draft fan 4, a heat exchanger 5, a combustor 61, a small fan 62 and a primary air pipe 63.

The first heat storage tank 11 is connected with a four-way reversing valve 3 through a first reversing pipe 121; the second heat storage tank 12 is connected with a four-way reversing valve 3 through a second reversing pipe 122; the blower 2 is connected with the four-way reversing valve 3 through a secondary air pipe 7; the induced draft fan 4 is connected with the four-way reversing valve 3 through a flue gas pipeline 8; the combustor 61, the first heat storage tank 11 and the second heat storage tank 12 are connected with a combustion space; the combustor 61 is connected with an external fuel gas source through a fuel gas pipeline 9, and the small fan 62 is connected with the combustor 61 through a primary air pipe 63. The primary air pipe 73, the flue gas pipeline 8 and the fuel gas pipeline 9 respectively penetrate through the heat exchanger 5. In this example: the heat exchanger 5 adopts a condensing heat exchanger.

In practice, the working process is as follows:

a four-way guide valve 3 is arranged to lead the air blower 2 to be communicated with the first heat storage box 11 and lead the induced draft fan 4 to be communicated with the second heat storage box 12; an external gas source outputs gas to the combustor 61 through a gas pipeline 9, and meanwhile, the small fan 62 blows external air into the combustor 61 through the primary air pipe 63. Meanwhile, the blower 2 introduces outside air into the first heat storage tank 11, heats the air by the heat accumulator in the first heat storage tank 11, and then enters the combustion chamber, so that the burner 61 is ignited in the combustion chamber and keeps continuously working. At this moment, the high-temperature flue gas generated by the burner 61 in the working process firstly enters the second heat storage tank 12 under the action of the draught fan 4, exchanges heat with the heat accumulator in the second heat storage tank 12, and enables the heat accumulator in the second heat storage tank 12 to store heat, and the high-temperature flue gas is primarily cooled. And then the high-temperature flue gas after primary cooling enters a heat exchanger 5. At this time, the primarily cooled high-temperature flue gas is further subjected to heat exchange with the fuel gas in the fuel gas pipeline 9 and the air blown into the primary air pipe 63 by the small fan 62 in the heat exchanger 5, and the high-temperature flue gas is finally discharged out of the combustion chamber through the induced draft fan 4 after being subjected to secondary cooling by the heat exchanger 5 for subsequent treatment. Meanwhile, the temperature of the air blown into the combustor 61 by the small fan 62 and the temperature of the gas output into the combustor 61 by the gas pipeline 9 are increased, thereby reducing the energy consumption of the combustor 61 in the ignition process. After working for a period, the flow direction of the gas is switched through the four-way guide valve 3, so that the air blower 2 is communicated with the second heat storage box 12, and the induced draft fan 4 is communicated with the first heat storage box 11; at this time, the first heat storage tank 11 and the second heat storage tank 12 alternate with each other to perform the next heat storage operation. From this, through the secondary heat transfer of heat exchanger to the high temperature flue gas of combustion chamber exhaust, showing and promoting the heat recovery rate.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. The protection scope of the present invention is subject to the protection scope of the claims.